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Test Compendium


Test Code

  • 2047

Test Synonym

  • GESTATIONAL GLUCOSE SCREEN, Glucose, Gestational, 1 Hr


  • Female


  • 5 mL

Minimum Volume

  • 0.75 mL

Specimen Requirements

  • Plasma / Serum


  • Grey Top Tube


  • Refrigerated

Turn Around Time

  • 1 day

Special Instructions

  • Grey Top Tube -Indicate 1 Hr

Additional Information

  • Gestational Diabetes Mellitus (GDM) Screening (1 hour Post Prandial, Post Load or Glucose Challenge Test ): 1. Performed between 24 and 28 weeks of gestation on all pregnant women not identified as having glucose intolerance. 2. A 50 gm oral glucose load without regard to time of day or time of last meal is given. 3. Plasma glucose at 1 hour is measured. 4. If the glucose is >= 140 mg/dL, a glucose tolerance test should be performed.

Specimen Stability

  • Serum (no hemolysis): 8 hours at 15-25 °C, 72 hours at 2-8 °C, Fluoride plasma: 3 days at 15-25 °C

Reference Range

  • Fasting Sex Message Lines Ref Ranges Unit of Measure
    The 140 mg/dL abnormal threshold for Glucose screening identifies 80% of women with gestational diabetes. A lower cutoff of 130 mg/dL will identify 90% of women with gestational diabetes. ACOG recommends follow-up of an abnormal gestational glucose screen with a Gestational 3-hour Glucose Challenge Test after oral administration of a 100 gram glucose dose. 65 - 139 mg/dL